ARM (Thumb Mode) _CPU_Context_switch_arm

[Sebastian Huber]

On 02/26/2013 09:39 PM, Joel Sherrill wrote:
>>>> 2008-04-17    Joel Sherrill <joel.sherrill at oarcorp.com>
>>>>
>>>>      * cpu.c: Add arm_cpu_mode so ARM BSP can overrid default value for cpsr.
>>>>
>>>> Maybe if this was an extern and the BSP defined the variable and
>>>> initialised it it would be easier to notice. I never thought of looking
>>>> in cpu.c for places to modify.
>>>>
>>> Wow! I don't remember that change at all. It doesn't even sound like the
>>> way I would normally solve this problem. :(
>>>
>>> Sebastian.. do you remember this?
>> I always wondered why we have this arm_cpu_mode variable.
>>
>>> is there a better way to accomplish this?
>> I would simply remove this and use:
> The only BSP changing that variable is the nds
>
>    /* set the cpu mode to system user */
>    arm_cpu_mode = 0x1f;
>
> What's the impact of 0x13 (default) versus 0x1f?

The 0x1f is the system mode.  I don't know why the NDS uses this mode.  It 
should work with the SVC mode as all other ARMv4 BSPs.

-- 
Sebastian Huber, embedded brains GmbH

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